| File: | src/lib/libcrypto/asn1/bio_asn1.c |
| Warning: | line 202, column 2 Value stored to 'ret' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
| 1 | /* $OpenBSD: bio_asn1.c,v 1.16 2022/01/07 09:02:17 tb Exp $ */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | /* Experimental ASN1 BIO. When written through the data is converted |
| 60 | * to an ASN1 string type: default is OCTET STRING. Additional functions |
| 61 | * can be provided to add prefix and suffix data. |
| 62 | */ |
| 63 | |
| 64 | #include <stdlib.h> |
| 65 | #include <string.h> |
| 66 | |
| 67 | #include <openssl/bio.h> |
| 68 | #include <openssl/asn1.h> |
| 69 | |
| 70 | #include "bio_local.h" |
| 71 | |
| 72 | /* Must be large enough for biggest tag+length */ |
| 73 | #define DEFAULT_ASN1_BUF_SIZE20 20 |
| 74 | |
| 75 | typedef enum { |
| 76 | ASN1_STATE_START, |
| 77 | ASN1_STATE_PRE_COPY, |
| 78 | ASN1_STATE_HEADER, |
| 79 | ASN1_STATE_HEADER_COPY, |
| 80 | ASN1_STATE_DATA_COPY, |
| 81 | ASN1_STATE_POST_COPY, |
| 82 | ASN1_STATE_DONE |
| 83 | } asn1_bio_state_t; |
| 84 | |
| 85 | typedef struct BIO_ASN1_EX_FUNCS_st { |
| 86 | asn1_ps_func *ex_func; |
| 87 | asn1_ps_func *ex_free_func; |
| 88 | } BIO_ASN1_EX_FUNCS; |
| 89 | |
| 90 | typedef struct BIO_ASN1_BUF_CTX_t { |
| 91 | /* Internal state */ |
| 92 | asn1_bio_state_t state; |
| 93 | /* Internal buffer */ |
| 94 | unsigned char *buf; |
| 95 | /* Size of buffer */ |
| 96 | int bufsize; |
| 97 | /* Current position in buffer */ |
| 98 | int bufpos; |
| 99 | /* Current buffer length */ |
| 100 | int buflen; |
| 101 | /* Amount of data to copy */ |
| 102 | int copylen; |
| 103 | /* Class and tag to use */ |
| 104 | int asn1_class, asn1_tag; |
| 105 | asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free; |
| 106 | /* Extra buffer for prefix and suffix data */ |
| 107 | unsigned char *ex_buf; |
| 108 | int ex_len; |
| 109 | int ex_pos; |
| 110 | void *ex_arg; |
| 111 | } BIO_ASN1_BUF_CTX; |
| 112 | |
| 113 | |
| 114 | static int asn1_bio_write(BIO *h, const char *buf, int num); |
| 115 | static int asn1_bio_read(BIO *h, char *buf, int size); |
| 116 | static int asn1_bio_puts(BIO *h, const char *str); |
| 117 | static int asn1_bio_gets(BIO *h, char *str, int size); |
| 118 | static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2); |
| 119 | static int asn1_bio_new(BIO *h); |
| 120 | static int asn1_bio_free(BIO *data); |
| 121 | static long asn1_bio_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp); |
| 122 | |
| 123 | static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
| 124 | asn1_ps_func *cleanup, asn1_bio_state_t next); |
| 125 | static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, |
| 126 | asn1_ps_func *setup, asn1_bio_state_t ex_state, |
| 127 | asn1_bio_state_t other_state); |
| 128 | |
| 129 | static const BIO_METHOD methods_asn1 = { |
| 130 | .type = BIO_TYPE_ASN1(22|0x0200), |
| 131 | .name = "asn1", |
| 132 | .bwrite = asn1_bio_write, |
| 133 | .bread = asn1_bio_read, |
| 134 | .bputs = asn1_bio_puts, |
| 135 | .bgets = asn1_bio_gets, |
| 136 | .ctrl = asn1_bio_ctrl, |
| 137 | .create = asn1_bio_new, |
| 138 | .destroy = asn1_bio_free, |
| 139 | .callback_ctrl = asn1_bio_callback_ctrl |
| 140 | }; |
| 141 | |
| 142 | const BIO_METHOD * |
| 143 | BIO_f_asn1(void) |
| 144 | { |
| 145 | return (&methods_asn1); |
| 146 | } |
| 147 | |
| 148 | static int |
| 149 | asn1_bio_new(BIO *b) |
| 150 | { |
| 151 | BIO_ASN1_BUF_CTX *ctx; |
| 152 | |
| 153 | if ((ctx = calloc(1, sizeof(*ctx))) == NULL((void *)0)) |
| 154 | return 0; |
| 155 | |
| 156 | if ((ctx->buf = malloc(DEFAULT_ASN1_BUF_SIZE20)) == NULL((void *)0)) { |
| 157 | free(ctx); |
| 158 | return 0; |
| 159 | } |
| 160 | ctx->bufsize = DEFAULT_ASN1_BUF_SIZE20; |
| 161 | ctx->asn1_class = V_ASN1_UNIVERSAL0x00; |
| 162 | ctx->asn1_tag = V_ASN1_OCTET_STRING4; |
| 163 | ctx->state = ASN1_STATE_START; |
| 164 | |
| 165 | b->init = 1; |
| 166 | b->ptr = (char *)ctx; |
| 167 | b->flags = 0; |
| 168 | |
| 169 | return 1; |
| 170 | } |
| 171 | |
| 172 | static int |
| 173 | asn1_bio_free(BIO *b) |
| 174 | { |
| 175 | BIO_ASN1_BUF_CTX *ctx; |
| 176 | |
| 177 | ctx = (BIO_ASN1_BUF_CTX *) b->ptr; |
| 178 | if (ctx == NULL((void *)0)) |
| 179 | return 0; |
| 180 | free(ctx->buf); |
| 181 | free(ctx); |
| 182 | b->init = 0; |
| 183 | b->ptr = NULL((void *)0); |
| 184 | b->flags = 0; |
| 185 | return 1; |
| 186 | } |
| 187 | |
| 188 | static int |
| 189 | asn1_bio_write(BIO *b, const char *in , int inl) |
| 190 | { |
| 191 | BIO_ASN1_BUF_CTX *ctx; |
| 192 | int wrmax, wrlen, ret, buflen; |
| 193 | unsigned char *p; |
| 194 | |
| 195 | if (!in || (inl < 0) || (b->next_bio == NULL((void *)0))) |
| 196 | return 0; |
| 197 | ctx = (BIO_ASN1_BUF_CTX *) b->ptr; |
| 198 | if (ctx == NULL((void *)0)) |
| 199 | return 0; |
| 200 | |
| 201 | wrlen = 0; |
| 202 | ret = -1; |
Value stored to 'ret' is never read | |
| 203 | |
| 204 | for (;;) { |
| 205 | switch (ctx->state) { |
| 206 | |
| 207 | /* Setup prefix data, call it */ |
| 208 | case ASN1_STATE_START: |
| 209 | if (!asn1_bio_setup_ex(b, ctx, ctx->prefix, |
| 210 | ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER)) |
| 211 | return 0; |
| 212 | break; |
| 213 | |
| 214 | /* Copy any pre data first */ |
| 215 | case ASN1_STATE_PRE_COPY: |
| 216 | ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free, |
| 217 | ASN1_STATE_HEADER); |
| 218 | if (ret <= 0) |
| 219 | goto done; |
| 220 | break; |
| 221 | |
| 222 | case ASN1_STATE_HEADER: |
| 223 | buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl; |
| 224 | if (buflen <= 0 || buflen > ctx->bufsize) |
| 225 | return -1; |
| 226 | ctx->buflen = buflen; |
| 227 | p = ctx->buf; |
| 228 | ASN1_put_object(&p, 0, inl, |
| 229 | ctx->asn1_tag, ctx->asn1_class); |
| 230 | ctx->copylen = inl; |
| 231 | ctx->state = ASN1_STATE_HEADER_COPY; |
| 232 | break; |
| 233 | |
| 234 | case ASN1_STATE_HEADER_COPY: |
| 235 | ret = BIO_write(b->next_bio, |
| 236 | ctx->buf + ctx->bufpos, ctx->buflen); |
| 237 | if (ret <= 0) |
| 238 | goto done; |
| 239 | |
| 240 | ctx->buflen -= ret; |
| 241 | if (ctx->buflen) |
| 242 | ctx->bufpos += ret; |
| 243 | else { |
| 244 | ctx->bufpos = 0; |
| 245 | ctx->state = ASN1_STATE_DATA_COPY; |
| 246 | } |
| 247 | break; |
| 248 | |
| 249 | case ASN1_STATE_DATA_COPY: |
| 250 | |
| 251 | if (inl > ctx->copylen) |
| 252 | wrmax = ctx->copylen; |
| 253 | else |
| 254 | wrmax = inl; |
| 255 | ret = BIO_write(b->next_bio, in, wrmax); |
| 256 | if (ret <= 0) |
| 257 | break; |
| 258 | wrlen += ret; |
| 259 | ctx->copylen -= ret; |
| 260 | in += ret; |
| 261 | inl -= ret; |
| 262 | |
| 263 | if (ctx->copylen == 0) |
| 264 | ctx->state = ASN1_STATE_HEADER; |
| 265 | if (inl == 0) |
| 266 | goto done; |
| 267 | break; |
| 268 | |
| 269 | default: |
| 270 | BIO_clear_retry_flags(b)BIO_clear_flags(b, ((0x01|0x02|0x04)|0x08)); |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | } |
| 275 | |
| 276 | done: |
| 277 | BIO_clear_retry_flags(b)BIO_clear_flags(b, ((0x01|0x02|0x04)|0x08)); |
| 278 | BIO_copy_next_retry(b); |
| 279 | |
| 280 | return (wrlen > 0) ? wrlen : ret; |
| 281 | } |
| 282 | |
| 283 | static int |
| 284 | asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *cleanup, |
| 285 | asn1_bio_state_t next) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | if (ctx->ex_len <= 0) |
| 290 | return 1; |
| 291 | for (;;) { |
| 292 | ret = BIO_write(b->next_bio, ctx->ex_buf + ctx->ex_pos, |
| 293 | ctx->ex_len); |
| 294 | if (ret <= 0) |
| 295 | break; |
| 296 | ctx->ex_len -= ret; |
| 297 | if (ctx->ex_len > 0) |
| 298 | ctx->ex_pos += ret; |
| 299 | else { |
| 300 | if (cleanup) |
| 301 | cleanup(b, &ctx->ex_buf, &ctx->ex_len, |
| 302 | &ctx->ex_arg); |
| 303 | ctx->state = next; |
| 304 | ctx->ex_pos = 0; |
| 305 | break; |
| 306 | } |
| 307 | } |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | static int |
| 312 | asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx, asn1_ps_func *setup, |
| 313 | asn1_bio_state_t ex_state, asn1_bio_state_t other_state) |
| 314 | { |
| 315 | if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) { |
| 316 | BIO_clear_retry_flags(b)BIO_clear_flags(b, ((0x01|0x02|0x04)|0x08)); |
| 317 | return 0; |
| 318 | } |
| 319 | if (ctx->ex_len > 0) |
| 320 | ctx->state = ex_state; |
| 321 | else |
| 322 | ctx->state = other_state; |
| 323 | return 1; |
| 324 | } |
| 325 | |
| 326 | static int |
| 327 | asn1_bio_read(BIO *b, char *in , int inl) |
| 328 | { |
| 329 | if (!b->next_bio) |
| 330 | return 0; |
| 331 | return BIO_read(b->next_bio, in , inl); |
| 332 | } |
| 333 | |
| 334 | static int |
| 335 | asn1_bio_puts(BIO *b, const char *str) |
| 336 | { |
| 337 | return asn1_bio_write(b, str, strlen(str)); |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | asn1_bio_gets(BIO *b, char *str, int size) |
| 342 | { |
| 343 | if (!b->next_bio) |
| 344 | return 0; |
| 345 | return BIO_gets(b->next_bio, str , size); |
| 346 | } |
| 347 | |
| 348 | static long |
| 349 | asn1_bio_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp) |
| 350 | { |
| 351 | if (b->next_bio == NULL((void *)0)) |
| 352 | return (0); |
| 353 | return BIO_callback_ctrl(b->next_bio, cmd, fp); |
| 354 | } |
| 355 | |
| 356 | static long |
| 357 | asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2) |
| 358 | { |
| 359 | BIO_ASN1_BUF_CTX *ctx; |
| 360 | BIO_ASN1_EX_FUNCS *ex_func; |
| 361 | long ret = 1; |
| 362 | |
| 363 | ctx = (BIO_ASN1_BUF_CTX *) b->ptr; |
| 364 | if (ctx == NULL((void *)0)) |
| 365 | return 0; |
| 366 | switch (cmd) { |
| 367 | |
| 368 | case BIO_C_SET_PREFIX149: |
| 369 | ex_func = arg2; |
| 370 | ctx->prefix = ex_func->ex_func; |
| 371 | ctx->prefix_free = ex_func->ex_free_func; |
| 372 | break; |
| 373 | |
| 374 | case BIO_C_GET_PREFIX150: |
| 375 | ex_func = arg2; |
| 376 | ex_func->ex_func = ctx->prefix; |
| 377 | ex_func->ex_free_func = ctx->prefix_free; |
| 378 | break; |
| 379 | |
| 380 | case BIO_C_SET_SUFFIX151: |
| 381 | ex_func = arg2; |
| 382 | ctx->suffix = ex_func->ex_func; |
| 383 | ctx->suffix_free = ex_func->ex_free_func; |
| 384 | break; |
| 385 | |
| 386 | case BIO_C_GET_SUFFIX152: |
| 387 | ex_func = arg2; |
| 388 | ex_func->ex_func = ctx->suffix; |
| 389 | ex_func->ex_free_func = ctx->suffix_free; |
| 390 | break; |
| 391 | |
| 392 | case BIO_C_SET_EX_ARG153: |
| 393 | ctx->ex_arg = arg2; |
| 394 | break; |
| 395 | |
| 396 | case BIO_C_GET_EX_ARG154: |
| 397 | *(void **)arg2 = ctx->ex_arg; |
| 398 | break; |
| 399 | |
| 400 | case BIO_CTRL_FLUSH11: |
| 401 | if (!b->next_bio) |
| 402 | return 0; |
| 403 | |
| 404 | /* Call post function if possible */ |
| 405 | if (ctx->state == ASN1_STATE_HEADER) { |
| 406 | if (!asn1_bio_setup_ex(b, ctx, ctx->suffix, |
| 407 | ASN1_STATE_POST_COPY, ASN1_STATE_DONE)) |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | if (ctx->state == ASN1_STATE_POST_COPY) { |
| 412 | ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free, |
| 413 | ASN1_STATE_DONE); |
| 414 | if (ret <= 0) |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | if (ctx->state == ASN1_STATE_DONE) |
| 419 | return BIO_ctrl(b->next_bio, cmd, arg1, arg2); |
| 420 | else { |
| 421 | BIO_clear_retry_flags(b)BIO_clear_flags(b, ((0x01|0x02|0x04)|0x08)); |
| 422 | return 0; |
| 423 | } |
| 424 | break; |
| 425 | |
| 426 | |
| 427 | default: |
| 428 | if (!b->next_bio) |
| 429 | return 0; |
| 430 | return BIO_ctrl(b->next_bio, cmd, arg1, arg2); |
| 431 | |
| 432 | } |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | |
| 437 | static int |
| 438 | asn1_bio_set_ex(BIO *b, int cmd, asn1_ps_func *ex_func, asn1_ps_func |
| 439 | *ex_free_func) |
| 440 | { |
| 441 | BIO_ASN1_EX_FUNCS extmp; |
| 442 | |
| 443 | extmp.ex_func = ex_func; |
| 444 | extmp.ex_free_func = ex_free_func; |
| 445 | return BIO_ctrl(b, cmd, 0, &extmp); |
| 446 | } |
| 447 | |
| 448 | static int |
| 449 | asn1_bio_get_ex(BIO *b, int cmd, asn1_ps_func **ex_func, |
| 450 | asn1_ps_func **ex_free_func) |
| 451 | { |
| 452 | BIO_ASN1_EX_FUNCS extmp; |
| 453 | int ret; |
| 454 | |
| 455 | ret = BIO_ctrl(b, cmd, 0, &extmp); |
| 456 | if (ret > 0) { |
| 457 | *ex_func = extmp.ex_func; |
| 458 | *ex_free_func = extmp.ex_free_func; |
| 459 | } |
| 460 | return ret; |
| 461 | } |
| 462 | |
| 463 | int |
| 464 | BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix, asn1_ps_func *prefix_free) |
| 465 | { |
| 466 | return asn1_bio_set_ex(b, BIO_C_SET_PREFIX149, prefix, prefix_free); |
| 467 | } |
| 468 | |
| 469 | int |
| 470 | BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix, asn1_ps_func **pprefix_free) |
| 471 | { |
| 472 | return asn1_bio_get_ex(b, BIO_C_GET_PREFIX150, pprefix, pprefix_free); |
| 473 | } |
| 474 | |
| 475 | int |
| 476 | BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix, asn1_ps_func *suffix_free) |
| 477 | { |
| 478 | return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX151, suffix, suffix_free); |
| 479 | } |
| 480 | |
| 481 | int |
| 482 | BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix, asn1_ps_func **psuffix_free) |
| 483 | { |
| 484 | return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX152, psuffix, psuffix_free); |
| 485 | } |